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INTRODUCTION

TABLE OF CONTENTS ––––––––––––––––––

INTRODUCTION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

 

AMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SAFETY PRECAUTIONS

  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

DECISIONS YOU MUST MAKE

. . . . . . . . . . . . . . . . . . . . . . . 3

 

Radio Equipment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

 

Power System Recommendations. . . . . . . . . . . . . . . . . . . 3

 

Propeller  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

 

Batteries and Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

ADDITIONAL ITEMS REQUIRED

  . . . . . . . . . . . . . . . . . . . . . . 4

 

Required Hardware and Accessories  . . . . . . . . . . . . . . . . 4

 

Adhesives and Building Supplies . . . . . . . . . . . . . . . . . . . 4

 

Optional Supplies and Tools . . . . . . . . . . . . . . . . . . . . . . . 4

 

Building Stand  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

IMPORTANT BUILDING NOTES

. . . . . . . . . . . . . . . . . . . . . . . 5

KIT INSPECTION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

KIT CONTENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

ORDERING REPLACEMENT PARTS

. . . . . . . . . . . . . . . . . . . . 6

BUILDING INSTRUCTIONS

  . . . . . . . . . . . . . . . . . . . . . . . . . . 6

 

Preparations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

BUILD THE WING

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

 

Install the Ailerons  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

 

Install the Aileron Servos and Pushrods . . . . . . . . . . . . . . 7

 

Finish the Wing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

BUILD THE FUSELAGE

  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

 

Install the Tail Section  . . . . . . . . . . . . . . . . . . . . . . . . . . 10

 

Assemble and Install the Landing Gear  . . . . . . . . . . . . . 12

 

Install the Tail Servos and Pushrods . . . . . . . . . . . . . . . . 13

 

Glow Engine Installation  . . . . . . . . . . . . . . . . . . . . . . . . 14

 

Brushless Motor Installation. . . . . . . . . . . . . . . . . . . . . . 18

 

Install the Receiver, Battery Pack and Switch Harness  . 20

 

Finish the Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

 

Apply the Decals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

GET THE MODEL READY TO FLY

  . . . . . . . . . . . . . . . . . . . . 23

 

Install And Operate The Motor Battery  . . . . . . . . . . . . . 23

 

Battery Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

 

Check The Control Directions  . . . . . . . . . . . . . . . . . . . . 24

 

Set The Control Throws  . . . . . . . . . . . . . . . . . . . . . . . . . 24

 

Balance The Model (C.G.)  . . . . . . . . . . . . . . . . . . . . . . . 25

 

Balance The Model Laterally . . . . . . . . . . . . . . . . . . . . . 25

PREFLIGHT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

 

Identify Your Model  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

 

Charge The Batteries  . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

 

Balance Propellers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

 

Ground Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

 

Range Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

ENGINE SAFETY PRECAUTIONS

  . . . . . . . . . . . . . . . . . . . . 26

LITHIUM BATTERY HANDLING AND USAGE

. . . . . . . . . . . 26

AMA SAFETY CODE (excerpts)

. . . . . . . . . . . . . . . . . . . . . . 27

 

General  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

 

Radio Control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

CHECK LIST

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

FLYING

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

 

Fuel Mixture Adjustments  . . . . . . . . . . . . . . . . . . . . . . . 28

 

Takeoff  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

 

Flight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

 

Landing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

INTRODUCTION ––––––––––––––––––––––––

Congratulations on your purchase of the Tower Hobbies Razor 
3D ARF! The Razor is a great fl ying model that is an ideal 
sport plane for the casual fl ier or a capable 3D performer. Both 
glow and electric provisions are provided with the kit. Radio 
equipment and battery packs are easily accessible beneath the 
canopy hatch that can be removed quickly without tools.

AMA

We urge you to join the AMA (Academy of Model Aeronautics) 
and a local R/C club. The AMA is the governing body of model 
aviation and membership is required to fl y at AMA clubs. 
Though joining the AMA provides many benefi ts, one of the 
primary reasons to join is liability protection. Coverage is not 
limited to fl ying at contests or on the club fi eld. It even applies 
to  fl ying at public demonstrations and air shows. Failure to 
comply with the Safety Code (excerpts printed in the back of 
the manual) may endanger insurance coverage. Additionally, 
training programs and instructors are available at AMA club 
sites to help you get started the right way. There are over 2,500 
AMA chartered clubs across the country. Contact the AMA at 
the address or toll-free phone number below:

Academy of Model Aeronautics

5151 East Memorial Drive
Muncie, IN 47302-9252
Tele. (800) 435-9262
Fax (765) 741-0057

Or via the Internet at: http://www.modelaircraft.org

IMPORTANT:

 Two of the most important things you can do 

to preserve the radio controlled aircraft hobby are to avoid fl y-
ing near full-scale aircraft and avoid fl ying near or over groups 
of people.

PROTECT YOUR MODEL, YOURSELF
& OTHERS.....FOLLOW THESE
IMPORTANT SAFETY PRECAUTIONS ––

1. Your Razor 3D ARF should not be considered a toy, but rather 
a sophisticated, working model that functions very much like a 
full-size airplane. Because of its performance capabilities, the 
Razor, if not assembled and operated correctly, could possibly 
cause injury to yourself or spectators and damage to property.

2. You must assemble the model 

according to the instructions

Do not alter or modify the model, as doing so may result in an 
unsafe or unfl yable model. In a few cases the instructions may 
differ slightly from the photos. In those instances the written 
instructions should be considered as correct.

3. You must take time to 

build straight, true

 and 

strong

.

4. You must use an R/C radio system that is in fi rst-class 
condition, and a correctly sized engine and components (fuel 
tank, wheels, etc.) throughout the building process.

Summary of Contents for Razor 3D

Page 1: ...l assembly or material used for final assembly no liability shall be assumed nor accepted for any damage resulting from the use by the user of the final user assembled product By the act of using the user assembled product the user accepts all resulting liability If the buyer is not prepared to accept the liability associated with the use of this product the buyer is advised to return this kit imm...

Page 2: ...emy of Model Aeronautics and a local R C club The AMA is the governing body of model aviation and membership is required to fly at AMA clubs Though joining the AMA provides many benefits one of the primary reasons to join is liability protection Coverage is not limited to flying at contests or on the club field It even applies to flying at public demonstrations and air shows Failure to comply with...

Page 3: ... are provided in parentheses RADIO EQUIPMENT The Razor 3DARF requires a minimum 4 channel radio system with four 44 oz in 3 2 kg cm minimum standard servos If you are installing a glow engine an additional standard servo is required for the throttle For maximum performance we recommend installing Tower Hobbies TS 160 digital servos for the control surfaces In addition two 12 305mm servo extensions...

Page 4: ...Drill bits 1 16 1 6mm 5 64 2mm 3 32 2 4mm 1 8 3 2mm Great Planes Tap Drill Set 6 32 GPMR8102 Glow engine installation only Tap handle GPMR8120 Glow engine installation only Small metal file 1 Blade Handle w 11 Blade Cap TOWR1010 11 Blades 5 TOWR1015 Medium T pins 100 HCAR5150 Tower Hobbies Custom Sealing Iron TOWR3250 Top Flite Hot Sock iron cover TOPR2175 220 grit sandpaper Panel Line Pen TOPQ251...

Page 5: ...uilt into this model However some technically minded modelers may wish to check these measurementsanyway Toviewthisinformationvisittheweb site at www greatplanes com and click on Technical Data Due to manufacturing tolerances which will have little or no effect on the way your model will fly please expect slight deviations between your model and the published values KIT INSPECTION Before starting ...

Page 6: ...ower Razor 3D ARF Wing Tower Razor 3D ARF Tail Set Tower Razor 3D ARF Canopy Tower Razor 3D ARF Landing Gear Tower Razor 3D ARF Wheel Pants Tower Razor 3D ARF Cowl Tower Razor 3D ARF Decal Set Tower Razor 3D ARF TOWA6040 TOWA6041 TOWA6042 TOWA6043 TOWA6044 TOWA6045 TOWA6046 TOWA6047 BUILDING INSTRUCTIONS PREPARATIONS 1 Ifyouhavenotdonesoalready removethemajorpartsofthe kit from the box and inspect...

Page 7: ...ugh 4 Apply six drops of thin CA to the top and bottom of each hinge without using accelerator After the CA glue has hardened confirm that the ailerons are secure by pulling on them and deflecting them up and down INSTALL THE AILERON SERVOS AND PUSHRODS 1 Attach a 12 305mm servo extension to each aileron servo Secure the connections using tape heat shrink tubing not included or special clips desig...

Page 8: ...ur armed servo arm for the aileron servo Enlarge the outer hole of the remaining arm with a 5 64 2mm drill bit Center the servo with your radio system and install the servo arm to the servo perpendicular to the servo case as shown Be sure to reinstall the servo arm screw into the servo Hinge Line Hinge Line CORRECT INCORRECT Hin 6 Position the control horns over the hardwood blocks embedded in the...

Page 9: ...ors Thread the clevises up or down on the pushrods as necessary to center the ailerons with the servo arms centered When satisfied slide the silicone clevis retainers to the ends of the clevises to secure them FINISH THE WING 1 Use epoxy to glue the nylon wing dowels into the center LE of the wing The smooth ends of the dowels should protrude from the root ribs approximately 1 2 13mm Use a paper t...

Page 10: ...ering and not burn into the wood The hotter the soldering iron the faster it must travel to melt a fine cut Peel off the covering 5 Trim the covering away from the gluing edges of the belly pan 6 Reinstall the wing onto the fuse we recommend lining the LE and TE of the wing between it and the fuse with wax paper to avoid accidentally gluing the wing to the fuse when gluing the belly pan in place M...

Page 11: ...r it left and right Measure from the wing tips to the stab tips and make those distances equal Wipe away excess epoxy with paper towels dampened with denatured alcohol Confirm that the stab and wing are still parallel A weight can be added to one side of the stab to make any small corrections Allow the epoxy to cure undisturbed The wing can now be removed from the fuselage and set aside 3 Test fit...

Page 12: ...wheel wire preventing it from rotating Some oil or petroleum jelly will help prevent this ASSEMBLE AND INSTALL THE LANDING GEAR 1 Secure the axles to the landing gear legs using the 5 16 24 nylon lock nuts 2 Slide a 5 32 4mm wheel collar onto each axle followed by a 2 1 2 64mm wheel and then another 5 32 4mm wheel collar Mark the location of the threaded holes in the wheel collars onto the axles U...

Page 13: ...n the axle Oil the axle if necessary INSTALL THE TAIL SERVOS AND PUSHRODS 1 Attach a 24 610mm servo extension to the rudder and elevator servos 2 The installation of the elevator servo and pushrod is the same as it was for the ailerons Make the elevator pushrod from a 12 305mm pushrod wire Be sure to harden the servo mounting screw holes with thin CA 3 Trim the rudder control horn as shown before ...

Page 14: ... fill line If installing a fill line puncture the top of the stopper above the sealed off fuel tube hole the photos show the installation of a fill line The fill and carb lines should extend out 1 2 13mm beyond the stopper and the vent line should be bent upwards and left uncut With the tubes installed in the stopper fit the stopper plates loosely in place with the 3 x 25mm phillips screw to hold ...

Page 15: ...f fuel tubing onto each line coming from the tank 6 If you are installing the O S FS81 a engine you will need to trim away the nose gear bearing on the top side of the engine mount as shown A rotary tool works well for this 7 Using four 6 32 x 1 25mm machine screws four 6 flat washers four 6 lock washers and thread locking compound attach the engine mount inverted to the firewall Leave the screws ...

Page 16: ...t using four 6 32 x 3 4 19mm machine screws four 6 flat washers and four 6 lock washers 9 Install the throttle servo onto the throttle servo tray using the hardware supplied with the servo 10 Loosely thread a 4 40 set screw into the brass screw lock pushrod connector Install the screw lock connector on the underside of the outer hole in the throttle servo arm using a nylon retainer Install the ser...

Page 17: ...screw lock pushrod connector on the throttle servo arm Connect the clevis to the throttle arm on the carburetor Make any necessary bends in the pushrod so the pushrod can actuate the throttle without binding When satisfied adjust the pushrod position in the screw lock pushrod connector so that the throttle servo properly opens and closes the carburetor Use the radio system to test the operation of...

Page 18: ... motor to the brushless motor mount using the included 3 x 8mm machine screws and thread locking compound If you haven t done so yet install the prop adapter to the motor case with the hardware included with the motor and thread locking compound 3 Attach the motor mount to the firewall using four 6 32 x 3 4 19mm machine screws four 6 flat washers four 6 lock washers and thread locking compound 4 L...

Page 19: ... the ESC 8 Mount the ESC tray to the brushless motor mount as shown Put a 4 flat washer onto each of the four 4 40 x 5 8 16mm machine screws and insert the screws through the holes in the tray side pieces and through the center slots in the brushless motor mount Tighten a 4 40 locknut and 4 flat washer onto each screw to secure the tray to the mount 9 Connect the motor lead wires to the ESC Wrappi...

Page 20: ... the motor using the ESC and your radio system do not install a propeller yet If the motor rotates the wrong direction it should rotate counter clockwise when viewing it from the front disconnect any two of the three motor leads and swap their position 11 Cut the covering from the cool air exit on the underside of the fuselage in the location shown INSTALL THE RECEIVER BATTERY PACK AND SWITCH HARN...

Page 21: ... installed a glow engine a cutout must be made for the exhaust needle valve access glow plug access and cool air exit A rotary tool such as a Dremel works very well for cutting holes in fiberglass We also suggest enlarging the air inlet with a glow engine installed to improve air flow across the engine head 2 Put 5 127mm strips of masking tape on the sides of the fuselage parallel to the fuse leng...

Page 22: ...bit Install the cowl onto the fuselage using four 4 x 3 8 9 5mm self tapping screws and four 4 flat washers 5 If you haven t done so already attach the muffler to the engine and connect the vent line from the fuel tank to the muffler Trim it to length if needed 6 Install your propeller using the prop washer and nut that came with the motor Enlarge the propeller slots in the spinner cone as necessa...

Page 23: ...ontrols the motor batteries will need to be charged Never charge the motor batteries while they are in the model Always remove the motor batteries from the model while charging IMPORTANT If using multiple battery packs that are connected with an adapter never charge the batteries together through the adapter Always charge each battery pack separately Charge the batteries then read the following pr...

Page 24: ...If any of the controls respond in the wrong direction use the servo reversing in the transmitter to reverse the servos connected to those controls Be certain the control surfaces have remained centered Adjust if necessary SET THE CONTROL THROWS Use a Great PlanesAccuThrow or a ruler to accurately measure and set the control throw of each control surface as indicated in the chart that follows If yo...

Page 25: ...nose drops the model is nose heavy and the battery pack and or receiver must be shifted aft or weight must be added to the tail to balance If possible relocate the battery pack and receiver to minimize or eliminate any additional ballast required If additional weight is required nose weight may be easily added by using a spinner weight GPMQ4645 for the 1 oz 28g weight or GPMQ4646 for the 2 oz 57g ...

Page 26: ...connectors poor solder joints in your battery pack or a defective cell or a damaged receiver crystal from a previous crash ENGINE SAFETY PRECAUTIONS FAILURE TO FOLLOW THESE SAFETY PRECAU TIONS MAY RESULT IN SEVERE INJURY TO YOURSELF AND OTHERS Keep all engine fuel in a safe place away from high heat sparks or flames as fuel is very flammable Do not smoke near the engine or fuel and remember that e...

Page 27: ...r other person touch a powered model in flight nor should any part of the model other than the landing gear intentionally touch the ground except while landing CHECK LIST During the last few moments of preparation your mind may be elsewhere anticipating the excitement of the first flight Because of this you may be more likely to overlook certain checks and procedures that should be performed befor...

Page 28: ...r to counteract engine torque Be smooth on the elevator stick allowing the model to establish a gentle climb to a safe altitude before turning into the traffic pattern FLIGHT For reassurance and to keep an eye on other traffic it is a good idea to have an assistant on the flight line with you Tell him to remind you to throttle back once the plane gets to a comfortable altitude While full throttle ...

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